Composite materials are broadly defined as those in which a binder is reinforced with a strengthening material. In modern terms, the binder is usually a resin, and the reinforcing material consists of glass strands (fiberglass), carbon fibers or aramid fibers. However, there are other composites too, such as ferrocement and wood resins, which are still used in boatbuilding.
Check out ThoughCo.’s marine industry composite information: